Dark rain Clouds are clouds that are black when it rains
Nimbus clouds are heavy dark clouds.
cirrus clouds are dark and usally bring rain
dark clouds gives heavy rain while white clouds gives us fine weather
Clouds don't turn dark. They get larger and thicker and cover the sun more effectively, and that makes the bottoms of the clouds appear dark and makes it dark underneath them.
snow or rain
Dark rain Clouds are clouds that are black when it rains
Probably.
Dark rain Clouds are clouds that are black when it rains
Nimbus clouds are heavy dark clouds.
cirrus clouds are dark and usally bring rain